Year	Percent
1950	16.94866
1955	16.74801
1960	16.6138
1965	14.76141
1970	15.19167
1975	14.59463
1980	16.63546
1985	19.04868
1990	24.0498
1995	26.14718
2000	28.04425
2005	29.18297
2010	28.8267
2015	27.68124
2020	25.51197
2025	23.30768
2030	20.98814
2035	20.43436
2040	20.29436
2045	20.66456
2050	22.49656
2055	22.93782
2060	23.26093
2065	23.28049
2070	22.25281
2075	21.70767
2080	21.45086
2085	21.26962
2090	20.87615
2095	20.34074
2100	19.84574